Update pocketmine/errorhandler requirement from ^0.6.0 to ^0.7.0

Updates the requirements on [pocketmine/errorhandler](https://github.com/pmmp/ErrorHandler) to permit the latest version.
- [Release notes](https://github.com/pmmp/ErrorHandler/releases)
- [Commits](pmmp/ErrorHandler@0.6.0...0.7.0)

---
updated-dependencies:
- dependency-name: pocketmine/errorhandler
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -40,7 +40,7 @@
       "pocketmine/binaryutils": "^0.2.1",
       "pocketmine/callback-validator": "^1.0.2",
       "pocketmine/color": "^0.3.0",
-      "pocketmine/errorhandler": "^0.6.0",
+      "pocketmine/errorhandler": "^0.7.0",
       "pocketmine/locale-data": "~2.19.0",
       "pocketmine/log": "^0.4.0",
       "pocketmine/math": "~1.0.0",